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Investments (Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ (332,708)	$ (277,023)
Deferred tax benefit (expense)	40,427	29,024
Change in unrealized appreciation (depreciation), net of deferred taxes, included in shareholders' equity	(292,281)	(247,999)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ (332,708)	$ (277,023)

X

- Definition

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount, before tax and after adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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